36,230
edits
DM501: Difference between revisions
Jump to navigation
Jump to search
no edit summary
No edit summary |
No edit summary |
||
| (31 intermediate revisions by 5 users not shown) | |||
| Line 1: | Line 1: | ||
{{TM500 | mfg=Tektronix | type=DM501 | function=4½ digit | {{TM500 | mfg=Tektronix | type=DM501 | function=4½ digit multimeter | class=multimeter | image=DM501 front.jpg | introduced=1972 | discontinued=1980 | | ||
manuals= | 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 [[ | 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 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 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) }} | |||
{{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 }} | |||
{{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 }} | |||
{{Spec | Temperature range and accuracy | –55°C to +125°C (±1.5°C), +125°C to 150°C (±2.5°C) }} | |||
{{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== | ==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 | |||
</gallery> | </gallery> | ||
==See also== | |||
* [[Media:Siliconix_LD120_and_LD121A_datasheets.pdf|Siliconix LD120 and LD121A datasheets]] | |||
* [[Fairchild 3814]] counter IC | |||
* [[307-1015-00]] input voltage divider | |||