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{{TM500 | mfg=Tektronix | type=DM501 | function=4½ digit True RMS (DM501A only) multimeter | class=multimeter | image=DM501 front.jpg | introduced=1972 | discontinued=1984 |
{{TM500 | mfg=Tektronix | type=DM501 | function=4½ digit multimeter | class=multimeter | image=Tek DM501.JPG | introduced=1972 | discontinued=1980 |
manuals=
designers= |manuals=
* [http://w140.com/tek_dm501.pdf Tektronix DM501 Manual (PDF)]
* [[Media:070-1446-00.pdf|Tektronix DM501 Manual]]
* [http://w140.com/tek_dm501a_070-2749-00_with_schematics.pdf Tektronix DM501A Manual (PDF, complete with schematics)]
* [http://w140.com/tek_dm501a.pdf Tektronix DM501A Manual (PDF, no schematics)]
* [http://w140.com/tekwiki/images/9/96/DM501A_schematics.pdf Tektronix DM501A Schematics (PDF)]
}}
}}
(See [[DM501A]] for the significantly different successor model.)


It also has a temperature input, requiring the [[P6058]] or [[P6430]] temperature probe (DM501A: [[P6601]] PT-100 probe).
It also has a temperature input, requiring the [[P6058]] temperature probe with a 4-pin [[LEMO S-series connector]].  The manual states that ''certain NPN transistors such as a 2N2484 may be used as temperature sensors in place of the probe with little or no selection of the transistor''.


The '''DM501 MOD718D''' variant replaced the temperature range with a 200 mV input range providing 10 μV resolution
The '''DM501 MOD718D''' variant replaced the temperature range with a 200 mV input range providing 10 μV resolution (see [[Media:Physical Measurements Handbook.pdf | Physical Measurements Handbook]]).
(see [[Media:Physical Measurements Handbook.pdf | Physical Measurements Handbook]]).


{{BeginSpecs}}
{{Spec | DC Voltage | 2 V<sub>DC</sub> to 200 V<sub>DC</sub> in decade ranges (0.1% + 0.01% FS), 1000 V<sub>DC</sub> (0.1% + 0.02% FS); Input resistance 10 MΩ, CMRR >100 dB at DC, 80 dB at 60 Hz (1 kΩ unbal.), NMRR ≥30 dB at 60 Hz + 20 dB/decade }}
{{Spec | AC Voltage | 2 V<sub>DC</sub> to 200 V<sub>AC</sub> in decade ranges, and 500 V<sub>AC</sub> (0.7% + 0.01% FS for sine inputs only); Input impedance 10 MΩ // ≤70 pF, CMRR unspecified }}
{{Spec | DC Current | 2 mA to 2 A in decade ranges, 0.2% + 0.05% FS }}
{{Spec | AC Current | 2 mA to 2 A in decade ranges, 0.6% + 0.05% FS (for 40 Hz to 1 kHz sine) }}
{{Spec | Ohms | 2 kΩ to 20 MΩ in decade ranges, current 1 mA to 0.1 μA respectively; 0.3% (20 MΩ: 0.5%) + 0.01% FS }}
{{Spec | Temperature | –55°C to +125°C (±1.5°C), +125°C to 150°C (±2.5°C) }}
{{EndSpecs}}


==Specifications==
===Options===
{|class="wikitable"
* Option 1: Ordering without P6058 Temp Probe
|+ Specification according to manual, see discussion  page
* Option 2: Without Temp Capability and Probe (visible by no ''Temp Out'' at the Front)
|-
! style="text-align:left;"| Range !! DM501 (15°C...35°C) !! DM501A (18°C...28°C)
|-
! Accuracy DC Voltmeter
|-
|200  mV<sub>DC</sub>|| N/A || 0.05%  + 0.015% FS
|-
|2  V<sub>DC</sub>||0.1% + 0.01% FS||0.05% + 0.01% FS
|-
|20  V<sub>DC</sub>||0.1% + 0.01% FS||0.05% +  0.01% FS
|-
|200  V<sub>DC</sub>||0.1% + 0.01% FS||0.05% + 0.01% FS
|-
|1000 V<sub>DC</sub>||0.1% + 0,02% FS||0.05% + 0.02% FS
|-
! Charactersitics DC Voltmeter
|-
|Input Resistance || colspan="2" style="text-align:center"|10 MΩ
|-
|CMRR || >100dB at DC; 80dB at 60Hz; 1  kΩ unbal. || >100dB at DC; 80dB at 50 & 60 Hz; 1  kΩ unbal.
|-
|NMRR || ≥30dB at 60Hz +20dB/decade || 60dB at 50Hz or 60 Hz +0.2 Hz
|-
! Accuracy AC Voltmeter 40 Hz ... 10 kHz  || Sine Wave || True RMS
|-
|200 mV<sub>AC</sub> || N/A || 0.6% + 0.05% FS True RMS
|-
| 2 V<sub>AC</sub>||0.7% +0.01% FS @ sine wave|| 0.6% +0.05% FS True RMS
|-
| 20  V<sub>DC</sub> || 0.7% +0.01% FS @ sine wave||  0.6% +0.05% FS True RMS
|-
| 200  V<sub>DC</sub> || 0.7% +0.01% FS @ sine wave||  0.6% +0.05% FS True RMS
|-
| 500  V<sub>DC</sub> || 0.7% +0.01% FS @ sine wave||  0.6% +0.2% FS True RMS
|-
! Charactersitics AC Voltmeter
|-
|Input Impedance ||10 MΩ paralleled by <70 pF || 10 MΩ paralleled by 160 pF
|-
|CMRR || Unknown || 60dB @ 50Hz and 60Hz with 1 kΩ unbalance
|-
! Accuracy Ohmmeter
|-
|200 Ω || N/A || 0.15% + 0.015% FS @ 1 mA
|-
|2 kΩ|| 0.3% + 0.01% FS @ 1 mA|| 0.15% + 0.015% FS @ 0.1/ 1 mA
|-
|20 kΩ||  0.3% + 0.01% FS @ 0.1 mA || 0.15% + 0.015% FS @ 10/ 100 µA
|-
|200 kΩ||  0.3% + 0.01% FS @ 10 μA|| 0.15% + 0.015% FS @ 1/ 10 µA
|-
| 2 MΩ||  0.3% + 0.01% FS @ 1 µA || 0.15% + 0.015% FS @ 1 µA (0.3%+0.015%FS @ 0.1 µA)
|-
| 20 MΩ|| 0.5% + 0.01% FS @ 0.1 µA|| 0.5% + 0.015% FS @ 0.1 µA
|-
! Accuracy DC Ammeter
|-
|200 µA || N/A || 0.2%0.015%FS @ 1 kΩ
|-
|2 mA || 0.2%+0.05% @ 100.1 Ω|| 0.2%0.015%FS @ 100 Ω
|-
| 20 mA ||  0.2%+0.05% @ 10.1 Ω || 0.2%0.015%FS @ 10.2 Ω
|-
|200 mA ||  0.2%+0.05% @ 1.1 Ω || 0.2%0.015%FS @ 1.2 Ω
|-
|2000 mA ||0.2%+0.05% @ 0.2 Ω || 0.2%0.015%FS @ 0.4 Ω
|-
! Accuracy AC Ammeter || 40 Hz...1 kHz sine wave || 20 Hz...10 kHz sine wave / I<sub>meas</sub>>5%FS
|-
|200µA || N/A || 0.6%+0.05%FS @ 1 kΩ
|-
| 2 mA || 0.6%+0.01%FS @ 100.1 Ω|| 0.6%+ 0.05% FS @ 100 Ω
|-
| 20 mA ||  0.6%+0.01%FS @ 10.1 Ω || 0.6%+ 0.05% FS @ 10.2 Ω
|-
| 200 mA ||  0.6%+0.01%FS @ 1.1 Ω|| 0.6%+ 0.05% FS @ 1.2 Ω
|-
| 2000 mA ||  0.6%+0.01%FS @ 0.2 Ω|| 0.6%+ 0.05% FS @ 0.4 Ω
|-
! Accuracy Temperature || [[P6058]] Probe (V<sub>BE</sub>) || [[P6601]] (PT100) Probe calibrated to instrument
|-
| -62°C...-55°C||  N/A  || ±2°C (±4°C any probe, uncal.)
|-
| -55°C...125°C|| ±1.5°C || ±2°C (±4°C any probe, uncal.)
|-
| 125°C...150°C|| ±2.5°C || ±2°C (±4°C any probe, uncal.)
|-
| 150°C...240°C|| N/A    || +0°C/-6°C (+2°C/-8°C any probe, uncal.)
|}


==Pictures==
==Links==
* [https://www.youtube.com/watch?v=GaSy1MezeNs                                  Tektronix DM501 Check in and Calibration] by Zenwizard Studios @ YouTube
 
{{Documents|Link=DM501}}


==Rear interface==
The DM501 has a rear input, selectable by a front-panel button, on B28 (Hi) / A29 (Lo), and digit-serial BCD outputs (TTL), see below.
The manual does not specify a limit to the input voltage on the rear interface but since this uses card-edge pins adjacent to logic output pins, sticking to the the DM501A specification (200 V peak / 100 V RMS) appears prudent.


===DM501===
==Internals==
<gallery>
The DM501 is precise to 4½ digits, but not accurate to 4½ digits. The combination of an ADC built from opamps and discretes combined with a noisy high-frequency isolated power supply make for barely achievable 3½ digit accuracy over all ranges. Every TM500 DVM after the 501 (including the [[DM501A]], the [[DM502]], and so on) used integrated A-to-D converters and a mains-frequency isolated power supply.
DM501 front.jpg | DM501
DM501_open_left.jpg|DM501 open left side
Tek_DM501_integrator_pcb-comp_side.jpg|DM501 integrator board
Tek_DM501_integrator_pcb-solder_side.jpg|DM501 integrator board solder side


</gallery>
==Pictures==


===DM501A===
<gallery>
<gallery>
Tek dm501a on.jpg|DM501A
DM501 front.jpg     | DM501
Tek dm501a 1.jpg | DM501A
DM501_open_left.jpg | DM501 open left side
Tek dm501a ext1.jpg|DM501A on an extension cable
Tek_DM501_integrator_pcb-comp_side.jpg | DM501 integrator board
Tek dm501a dark.jpg|DM501A
DM501 1977.jpg     | Two late DM501s with modified integrator boards
DM501A_rear_con.JPG|DM501A rear connector
Tek_DM501_integrator_pcb-solder_side.jpg | DM501 integrator board solder side
Tek-DM501A-RHS.jpg| DM501A RHS
DM501 rear interface.png | DM501 rear interface
TEK-DM501A-LHS.jpg| DM501A LHS
 
Tek-DM501A-LHS-removed shielding.jpg| DM501A LHS- removed shielding
</gallery>
</gallery>


 
==Components==
* [http://w140.com/tekwiki/images/d/d5/Siliconix_LD120_and_LD121A_datasheets.pdf Siliconix LD120 and LD121A datasheets]
{{Parts|DM501}}
* [http://w140.com/tekwiki/wiki/Fairchild_3814 Fairchild 3814 counter IC]
* [http://w140.com/tekwiki/wiki/307-1015-00 307-1015-00 input voltage divider]

Revision as of 15:56, 2 July 2024

Tektronix DM501
4½ digit multimeter
Tektronix DM501

Produced from 1972 to 1980

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix DM501 is a 4½ digit multimeter plug-in for the TM500 system.

(See DM501A for the significantly different successor model.)

It also has a temperature input, requiring the P6058 temperature probe with a 4-pin LEMO S-series connector. The manual states that certain NPN transistors such as a 2N2484 may be used as temperature sensors in place of the probe with little or no selection of the transistor.

The DM501 MOD718D variant replaced the temperature range with a 200 mV input range providing 10 μV resolution (see Physical Measurements Handbook).

Key Specifications

DC Voltage 2 VDC to 200 VDC in decade ranges (0.1% + 0.01% FS), 1000 VDC (0.1% + 0.02% FS); Input resistance 10 MΩ, CMRR >100 dB at DC, 80 dB at 60 Hz (1 kΩ unbal.), NMRR ≥30 dB at 60 Hz + 20 dB/decade
AC Voltage 2 VDC to 200 VAC in decade ranges, and 500 VAC (0.7% + 0.01% FS for sine inputs only); Input impedance 10 MΩ // ≤70 pF, CMRR unspecified
DC Current 2 mA to 2 A in decade ranges, 0.2% + 0.05% FS
AC Current 2 mA to 2 A in decade ranges, 0.6% + 0.05% FS (for 40 Hz to 1 kHz sine)
Ohms 2 kΩ to 20 MΩ in decade ranges, current 1 mA to 0.1 μA respectively; 0.3% (20 MΩ: 0.5%) + 0.01% FS
Temperature –55°C to +125°C (±1.5°C), +125°C to 150°C (±2.5°C)

Options

  • Option 1: Ordering without P6058 Temp Probe
  • Option 2: Without Temp Capability and Probe (visible by no Temp Out at the Front)

Links

Documents Referencing DM501

Document Class Title Authors Year Links
Tekscope 1974 V6 N3.pdf Article The 31/53 Calculator-based Measurement Instrumentation Package John Mulvey 1974 31 • 153 • DM501 • DC503
070-2088-00.pdf Book TM500 Series Rear Interface Data Book 1975 AF501 • AM501 • AM502 • DC501 • DC502 • DC503 • DC504 • DC505 • DC505A • DM501 • DM502 • FG501 • FG502 • FG503 • MR501 • PG501 • PG502 • PG505 • PG506 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • RG501 • SC501 • SC502 • SG502 • SG503 • TG501
070-2088-01.pdf Book TM500 Series Rear Interface Data Book 1976 AF501 • AM501 • AM502 • AM511 • DC501 • DC502 • DC503 • DC504 • DC505 • DC505A • DD501 • DM501 • DM502 • FG501 • FG502 • FG503 • FG504 • LA501 • MR501 • PG501 • PG502 • PG505 • PG506 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • RG501 • SC501 • SC502 • SG502 • SG503 • SG504 • SW503 • TG501 • TR501 • TR502
070-2088-04.pdf Book TM500 Series Rear Interface Data Book 1985 AA501 • AF501 • AM501 • AM502 • AM503 • AM511 • DC501 • DC502 • DC503 • DC503A • DC504 • DC505 • DC505A • DC508 • DC508A • DC509 • DC510 • DC5009 • DC5010 • DD501 • DL502 • DM501 • DM501A • DM502 • DM502A • DM505 • DM5010 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • FG5010 • LA501 • LA501W • WR501 • MR501 • PG501 • PG502 • PG505 • PG506 • PG507 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • PS5010 • RG501 • SC501 • SC502 • SC503 • SC504 • SG502 • SG503 • SG504 • SG505 • SW503 • TG501 • TR501 • TR502 • MI5010 • MX5010 • SI5010

Rear interface

The DM501 has a rear input, selectable by a front-panel button, on B28 (Hi) / A29 (Lo), and digit-serial BCD outputs (TTL), see below. The manual does not specify a limit to the input voltage on the rear interface but since this uses card-edge pins adjacent to logic output pins, sticking to the the DM501A specification (200 V peak / 100 V RMS) appears prudent.

Internals

The DM501 is precise to 4½ digits, but not accurate to 4½ digits. The combination of an ADC built from opamps and discretes combined with a noisy high-frequency isolated power supply make for barely achievable 3½ digit accuracy over all ranges. Every TM500 DVM after the 501 (including the DM501A, the DM502, and so on) used integrated A-to-D converters and a mains-frequency isolated power supply.

Pictures

  • DM501

    DM501

  • DM501 open left side

    DM501 open left side

  • DM501 integrator board

    DM501 integrator board

  • Two late DM501s with modified integrator boards

    Two late DM501s with modified integrator boards

  • DM501 integrator board solder side

    DM501 integrator board solder side

  • DM501 rear interface

    DM501 rear interface

Components

Some Parts Used in the DM501

Part Part Number(s) Class Description Used in
307-1015-00 307-1015-00 Discrete component resistor network DM501
Fairchild 3814 156-0306-00 Monolithic integrated circuit 4½ digit dual-slope DVM controller 7A13 • 7L13 • 7L18 • DM501
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