DM501: Difference between revisions

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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=DM501 front.jpg | introduced=1972 | discontinued=1980 |
designers= |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)]
}}
}}
It also has a temperature input, requiring the [[P6058]] or [[P6430]] temperature probe (DM501A: [[P6601]] PT-100 probe).
(See [[DM501A]] for the significantly different successor model.)
 
It also has a temperature input, requiring the [[P6058]] or [[P6430]] temperature probe with a 4-pin [[LEMO S-series connector]].


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]]).
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]]).


==Specifications==
{{BeginSpecs}}
{|class="wikitable"
{{Spec | DC Voltage ranges and accuracy    | 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) }}
|+ Specification according to manual, see discussion  page
{{Spec | DC Voltage characteristics        | 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 ranges and accuracy    | 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) }}
! style="text-align:left;"| Range !! DM501 (15°C...35°C) !! DM501A (18°C...28°C)
{{Spec | AC Voltage characteristics        | Input impedance 10 MΩ // ≤70 pF, CMRR unspecified }}
|-
{{Spec | DC Current ranges and accuracy    | 2 mA to 2 A in decade ranges, 0.2% + 0.05% FS }}
! Accuracy DC Voltmeter
{{Spec | AC Current ranges and accuracy    | 2 mA to 2 A in decade ranges, 0.6% + 0.05% FS (for 40 Hz to 1 kHz sine) }}
|-
{{Spec | Ohms ranges and accuracy          | 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 }}
|200  mV<sub>DC</sub>|| N/A || 0.05%  + 0.015% FS
{{Spec | Temperature range and accuracy    | –55°C to +125°C (±1.5°C), +125°C to 150°C (±2.5°C) }}
|-
{{EndSpecs}}
|2  V<sub>DC</sub>||0.1% + 0.01% FS||0.05% + 0.01% FS
 
|-
==Internals==
|20  V<sub>DC</sub>||0.1% + 0.01% FS||0.05% +  0.01% FS
The DM501 is precise to 4½ digits, but not accurate to 4½ digits. The combination of a D-to-A converter 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.
|-
|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%FS @ 100.1 Ω|| 0.2%0.015%FS @ 100 Ω
|-
| 20 mA ||  0.2%+0.05%FS @ 10.1 Ω || 0.2%0.015%FS @ 10.2 Ω
|-
|200 mA ||  0.2%+0.05%FS @ 1.1 Ω || 0.2%0.015%FS @ 1.2 Ω
|-
|2000 mA ||0.2%+0.05%FS @ 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==
==Pictures==


===DM501===
<gallery>
<gallery>
DM501 front.jpg | DM501
DM501 front.jpg | DM501
Line 115: Line 33:
</gallery>
</gallery>


===DM501A===
==See also==
<gallery>
* [[Media:Siliconix_LD120_and_LD121A_datasheets.pdf|Siliconix LD120 and LD121A datasheets]]
Tek dm501a on.jpg|DM501A
* [[Fairchild 3814]] counter IC
Tek dm501a 1.jpg | DM501A
* [[307-1015-00]] input voltage divider
Tek dm501a ext1.jpg|DM501A Option 2 (no temperature range) on an extension cable
Tek dm501a dark.jpg|DM501A
DM501A_rear_con.JPG|DM501A rear connector
Tek-DM501A-RHS.jpg| DM501A RHS
TEK-DM501A-LHS.jpg| DM501A LHS
Tek-DM501A-LHS-removed shielding.jpg| DM501A LHS- removed shielding
</gallery>
 
 
* [http://w140.com/tekwiki/images/d/d5/Siliconix_LD120_and_LD121A_datasheets.pdf Siliconix LD120 and LD121A datasheets]
* [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 09:16, 6 March 2022

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 or P6430 temperature probe with a 4-pin LEMO S-series connector.

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 ranges and accuracy 2 VDC to 200 VDC in decade ranges (0.1% + 0.01% FS), 1000 VDC (0.1% + 0.02% FS)
DC Voltage characteristics 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 ranges and accuracy 2 VDC to 200 VAC in decade ranges, and 500 VAC (0.7% + 0.01% FS for sine inputs only)
AC Voltage characteristics Input impedance 10 MΩ // ≤70 pF, CMRR unspecified
DC Current ranges and accuracy 2 mA to 2 A in decade ranges, 0.2% + 0.05% FS
AC Current ranges and accuracy 2 mA to 2 A in decade ranges, 0.6% + 0.05% FS (for 40 Hz to 1 kHz sine)
Ohms ranges and accuracy 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 range and accuracy –55°C to +125°C (±1.5°C), +125°C to 150°C (±2.5°C)

Internals

The DM501 is precise to 4½ digits, but not accurate to 4½ digits. The combination of a D-to-A converter 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

  • DM501 integrator board solder side

    DM501 integrator board solder side

See also

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