DM501A
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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.
The DM501A was designed by Bill Mark.
Key Specifications
DC Voltage | 200 mVDC to 1000 VDC in decade ranges; 0.05% + 0.01% (200 mV: 0.015% / 1000 V: 0.02%) FS |
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DC Input characteristics | 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 |
AC Voltage | 200 mVDC to 500 VAC in decade ranges; 0.6% + 0.05% (500 V: 0.2%) FS; True RMS; |
AC Input characteristics | Input impedance 10 MΩ // ≤160 pF; CMRR 60 dB at 50 or 60 Hz (1 kΩ unbal.) |
DC Current | 200 μA to 2 A in decade ranges; 0.2% + 0.015% FS |
AC Current | 200 μA to 2 A in decade ranges; 0.6% + 0.05% FS (20 Hz-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; 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.); +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 |
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Tekscope 1979 V11 N3.pdf | Article | A New DMM Family for the TM 500 Series | Bill Mark | 1979 | DM501A • DM502A • DM505 • P6601 |
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
Components
Some Parts Used in the DM501A
Part | Part Number(s) | Class | Description | Used in |
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AD536 | 156-1259-00 | Monolithic integrated circuit | RMS/DC converter | DM501A • DM502A |
Siliconix LD120 | 156-1306-00 | Monolithic integrated circuit | 4½ digit integrating ADC (analog section) | DM501A |
Siliconix LD121A | 156-1305-00 | Monolithic integrated circuit | 4½ digit integrating ADC (digital section) | DM501A |