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DM501: Difference between revisions
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* [ | {{TM500 | mfg=Tektronix | type=DM501 | function=4½ digit multimeter | class=multimeter | image=Tek DM501.JPG | introduced=1972 | discontinued=1980 | | ||
* [ | designers= |manuals= | ||
* [[Media:070-1446-00.pdf|Tektronix DM501 Manual]] | |||
}} | |||
(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 [[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}} | |||
===Options=== | |||
* Option 1: Ordering without P6058 Temp Probe | |||
* Option 2: Without Temp Capability and Probe (visible by no ''Temp Out'' at the Front) | |||
==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. | |||
==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== | |||
<gallery> | <gallery> | ||
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 | |||
DM501 rear interface.png | DM501 rear interface | |||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|DM501}} | |||