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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)]
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| * [http://w140.com/tek_dm501a.pdf Tektronix DM501A Manual (PDF, no schematics)]
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| * [http://w140.com/tekwiki/images/9/96/DM501A_schematics.pdf Tektronix DM501A Schematics (PDF)]
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| }} | | }} |
| 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.) |
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| | It also has a temperature input, requiring the [[P6058]] or [[P6430]] temperature probe with a 4-pin [[LEMO S-series connector]]. |
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| 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]]). |
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| ==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 }} |
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| | {{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
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| |-
| | ==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. |
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| |200 V<sub>DC</sub>||0.1% + 0.01% FS||0.05% + 0.01% FS
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| |1000 V<sub>DC</sub>||0.1% + 0,02% FS||0.05% + 0.02% FS
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| |- | |
| ! Charactersitics DC Voltmeter
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| |Input Resistance || colspan="2" style="text-align:center"|10 MΩ | |
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| |CMRR || >100dB at DC; 80dB at 60Hz; 1 kΩ unbal. || >100dB at DC; 80dB at 50 & 60 Hz; 1 kΩ unbal.
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| |NMRR || ≥30dB at 60Hz +20dB/decade || 60dB at 50Hz or 60 Hz +0.2 Hz
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| |- | |
| ! Accuracy AC Voltmeter 40 Hz ... 10 kHz || Sine Wave || True RMS
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| |200 mV<sub>AC</sub> || N/A || 0.6% + 0.05% FS True RMS | |
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| | 2 V<sub>AC</sub>||0.7% +0.01% FS @ sine wave|| 0.6% +0.05% FS True RMS
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| | 20 V<sub>DC</sub> || 0.7% +0.01% FS @ sine wave|| 0.6% +0.05% FS True RMS
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| | 200 V<sub>DC</sub> || 0.7% +0.01% FS @ sine wave|| 0.6% +0.05% FS True RMS | |
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| | 500 V<sub>DC</sub> || 0.7% +0.01% FS @ sine wave|| 0.6% +0.2% FS True RMS
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| |- | |
| ! Charactersitics AC Voltmeter
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| |Input Impedance ||10 MΩ paralleled by <70 pF || 10 MΩ paralleled by 160 pF
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| |CMRR || Unknown || 60dB @ 50Hz and 60Hz with 1 kΩ unbalance
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| ! Accuracy Ohmmeter
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| |200 Ω || N/A || 0.15% + 0.015% FS @ 1 mA
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| |2 kΩ|| 0.3% + 0.01% FS @ 1 mA|| 0.15% + 0.015% FS @ 0.1/ 1 mA | |
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| |20 kΩ|| 0.3% + 0.01% FS @ 0.1 mA || 0.15% + 0.015% FS @ 10/ 100 µA
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| |200 kΩ|| 0.3% + 0.01% FS @ 10 μA|| 0.15% + 0.015% FS @ 1/ 10 µA
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| | 2 MΩ|| 0.3% + 0.01% FS @ 1 µA || 0.15% + 0.015% FS @ 1 µA (0.3%+0.015%FS @ 0.1 µA)
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| | 20 MΩ|| 0.5% + 0.01% FS @ 0.1 µA|| 0.5% + 0.015% FS @ 0.1 µA
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| |- | |
| ! Accuracy DC Ammeter
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| |- | |
| |200 µA || N/A || 0.2%0.015%FS @ 1 kΩ
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| |2 mA || 0.2%+0.05%FS @ 100.1 Ω|| 0.2%0.015%FS @ 100 Ω
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| | 20 mA || 0.2%+0.05%FS @ 10.1 Ω || 0.2%0.015%FS @ 10.2 Ω
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| |200 mA || 0.2%+0.05%FS @ 1.1 Ω || 0.2%0.015%FS @ 1.2 Ω
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| |2000 mA ||0.2%+0.05%FS @ 0.2 Ω || 0.2%0.015%FS @ 0.4 Ω
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| ! Accuracy AC Ammeter || 40 Hz...1 kHz sine wave || 20 Hz...10 kHz sine wave / I<sub>meas</sub>>5%FS
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| |200µA || N/A || 0.6%+0.05%FS @ 1 kΩ
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| | 2 mA || 0.6%+0.01%FS @ 100.1 Ω|| 0.6%+ 0.05% FS @ 100 Ω
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| | 20 mA || 0.6%+0.01%FS @ 10.1 Ω || 0.6%+ 0.05% FS @ 10.2 Ω
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| | 200 mA || 0.6%+0.01%FS @ 1.1 Ω|| 0.6%+ 0.05% FS @ 1.2 Ω
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| | 2000 mA || 0.6%+0.01%FS @ 0.2 Ω|| 0.6%+ 0.05% FS @ 0.4 Ω
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| ! Accuracy Temperature || [[P6058]] Probe (V<sub>BE</sub>) || [[P6601]] (PT100) Probe calibrated to instrument
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| | -62°C...-55°C|| N/A || ±2°C (±4°C any probe, uncal.)
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| | -55°C...125°C|| ±1.5°C || ±2°C (±4°C any probe, uncal.)
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| | 125°C...150°C|| ±2.5°C || ±2°C (±4°C any probe, uncal.)
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| | 150°C...240°C|| N/A || +0°C/-6°C (+2°C/-8°C any probe, uncal.)
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| |}
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| ==Pictures== | | ==Pictures== |
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| ===DM501===
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| <gallery> | | <gallery> |
| DM501 front.jpg | DM501 | | DM501 front.jpg | DM501 |
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| </gallery> | | </gallery> |
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| ===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
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| Tek dm501a dark.jpg|DM501A
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| DM501A_rear_con.JPG|DM501A rear connector
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| Tek-DM501A-RHS.jpg| DM501A RHS
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| TEK-DM501A-LHS.jpg| DM501A LHS
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| Tek-DM501A-LHS-removed shielding.jpg| DM501A LHS- removed shielding
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| </gallery>
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| * [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] | |