DM501A
The Tektronix DM501A is a 4½ digit True RMS multimeter plug-in for the TM500 system.
It replaced the DM501 (which suffered from accuracy limitations) in 1980. It also has a temperature input, requiring the P6601 PT-100 probe with a 2-pin LEMO S-series connector.
Key Specifications
| DC Voltage | 200 mVDC to 200 VDC in decade ranges, and 1000 VDC; Input resistance 10 MΩ, CMRR >100 dB at DC, 80 dB at 50 and 60 Hz (1 kΩ unbal.), NMRR 60 dB at 50 or 60 Hz |
|---|---|
| DC Voltage accuracy | 0.05% + 0.01% (200 mV: 0.015% / 1000 V: 0.02%) FS |
| AC Voltage | 200 mVDC to 200 VAC in decade ranges, and 500 VAC; Input impedance 10 MΩ // ≤160 pF, CMRR 60 dB at 50 or 60 Hz (1 kΩ unbal.) |
| AC Voltage accuracy | 0.6% + 0.05% (500 V: 0.2%) FS; True RMS; |
| DC Current | 200 μA to 2 A in decade ranges |
| DC Current accuracy | 0.2% + 0.015% FS |
| AC Current | 200 μA to 2 A in decade ranges |
| AC Current accuracy | 0.6% + 0.05% FS (for 20 Hz to 10 kHz sine >5% FS) |
| Ohms | 200 Ω to 20 MΩ in decade range; current 1 mA, 1 mA, 100 μA – 0.1 μA respectively |
| Ohms accuracy | 0.15% (20 MΩ: 0.5%) + 0.015% FS |
| Temperature | –62°C to +240°C (+0/-6°C or +2/-8°C any probe, uncal.) |
| Temperature accuracy | +150°C, ±2°C cal. probe, ±4°C uncal. probe; +150°C to +240°C, +0/-6°C or +2/-8°C any probe, uncal. |
Links
Documents Referencing DM501A
| Document | Class | Title | Authors | Year | Links |
|---|---|---|---|---|---|
| Tekscope 1979 V11 N3.pdf | Article | A New DMM Family for the TM 500 Series | Bill Mark | 1979 | DM501A • DM502A • DM505 • P6601 |
| 070-2088-04.pdf | Book | TM500 Series Rear Interface Data Book | 1985 | AA501 • AF501 • AM501 • AM502 • AM503 • AM511 • DC501 • DC502 • DC503 • DC503A • DC504 • DC505 • DC505A • DC508 • DC508A • DC509 • DC510 • DC5009 • DC5010 • DD501 • DL502 • DM501 • DM501A • DM502 • DM502A • DM505 • DM5010 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • FG5010 • LA501 • LA501W • WR501 • MR501 • PG501 • PG502 • PG505 • PG506 • PG507 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • PS5010 • RG501 • SC501 • SC502 • SC503 • SC504 • SG502 • SG503 • SG504 • SG505 • SW503 • TG501 • TR501 • TR502 • MI5010 • MX5010 • SI5010 |
Rear interface
The DM501A has a rear input, selectable by a front-panel button, on B28 (Hi) / A29 (Lo). Unlike the DM501 (non-A), it has no digital outputs. Input voltage on the rear interface is limited to 200 V peak / 100 V RMS.
Pictures
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DM501A
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DM501A
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DM501A Option 2 (no temperature range) on an extension cable
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DM501A
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DM501A rear connector
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DM501A RHS
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DM501A LHS
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DM501A LHS, shielding removed
Parts
Some Parts Used in the DM501A
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| AD536 | 156-1259-00 | Monolithic integrated circuit | RMS/DC converter | DM501A • DM502A • DM5010 • Keithley 177 • Keithley 179 • Keithley 195A |
| Siliconix LD120 | 156-1306-00 | Monolithic integrated circuit | 4½ digit integrating ADC (analog section) | DM501A • DM5010 |
| Siliconix LD121A | 156-1305-00 | Monolithic integrated circuit | 4½ digit integrating ADC (digital section) | 7A13 • DM501A |