DM501: Difference between revisions

DM501 (view source)

Revision as of 09:16, 6 March 2022

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-{{TM500 | mfg=Tektronix | type=DM501 | function=4½ digit True RMS multimeter | class=multimeter | image=DM501 front.jpg | introduced=1978 | discontinued=1984 |
+{{TM500 | mfg=Tektronix | type=DM501 | function=4½ digit multimeter | class=multimeter | image=DM501 front.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)]
 }}
+(See [[DM501A]] for the significantly different successor model.)
-It also has a temperature input, requiring the [[P6601]] PT-100 probe.
+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]]).
 {{BeginSpecs}}
-{{Spec | DC V ranges | 200 mV, 2 V, 20 V, 200 V, 1000 V }}
+{{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) }}
-{{Spec | DC V accuracy | 0.05% of reading + 0.01% FS in 2 V to 200 V ranges @ +18 °C to +28 °C }}
+{{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 | DC V input resistance | 10 MΩ }}
+{{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) }}
-{{Spec | AC V ranges | 200 mV, 2 V, 20 V, 200 V, 500 V }}
+{{Spec | AC Voltage characteristics        | Input impedance 10 MΩ // ≤70 pF, CMRR unspecified }}
-{{Spec | AC V accuracy | 0.6% of reading + 0.05% FS in 0.2 V to 200 V ranges, 40 Hz to 10 kHz @ +18 °C to +28 °C }}
+{{Spec | DC Current ranges and accuracy    | 2 mA to 2 A in decade ranges, 0.2% + 0.05% FS }}
-{{Spec | AC V input resistance | 10 MΩ // 160 pF }}
+{{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 | dB ranges | -40, -20, 0, +20, +40 dB }}
+{{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 }}
-{{Spec | Ω ranges | 200 Ω, 2 kΩ, 20 kΩ, 200 kΩ, 2 MΩ, 20  MΩ }}
+{{Spec | Temperature range and accuracy    | –55°C to +125°C (±1.5°C), +125°C to 150°C (±2.5°C) }}
-{{Spec | Ω accuracy | 0.15% of reading + 0.015% FS, 200 Ω to 2 MΩ ranges @ +18 °C to +28 °C }}
-{{Spec | DC A ranges | 200 μA, 2 mA, 20 mA, 200 mA, 2 A }}
-{{Spec | DC A accuracy | 0.2% of reading + 0.015% FS @ +18 °C to +28 °C }}
-{{Spec | AC A ranges | 200 μA, 2 mA, 20 mA, 200 mA, 2 A }}
-{{Spec | AC A accuracy | 0.6% of reading + 0.05% FS, 20 Hz to 10 kHz @ +18 °C to +28 °C }}
-{{Spec | Temperature range | -62 °C to +240 °C }}
-{{Spec | Temperature accuracy | ±2 °C from -62 °C to +150 °C with probe calibrated to instrument, @ +18 °C to +28 °C ambient }}
 {{EndSpecs}}
+==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==
@@ Line 30: / Line 27: @@
 <gallery>
 DM501 front.jpg | DM501
-Tek dm501a 1.jpg | DM501A
+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>
-* [http://w140.com/tekwiki/images/d/d5/Siliconix_LD120_and_LD121A_datasheets.pdf Siliconix LD120 and LD121A datasheets]
+==See also==
+* [[Media:Siliconix_LD120_and_LD121A_datasheets.pdf|Siliconix LD120 and LD121A datasheets]]
+* [[Fairchild 3814]] counter IC
+* [[307-1015-00]] input voltage divider

DM501: Difference between revisions

DM501 (view source)

Revision as of 09:16, 6 March 2022

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