DM501A: Difference between revisions

Revision as of 01:42, 14 September 2023

Tektronix DM501A
4½ digit True RMS multimeter Tektronix DM501A Produced from 1980 to 1984 Manuals Tektronix DM501A Manual (with schematics) Tektronix DM501A Manual (no schematics) Tektronix DM501A Schematics (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

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 mV_DC to 200 V_DC in decade ranges, and 1000 V_DC; 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 mV_DC to 200 V_AC in decade ranges, and 500 V_AC; 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.

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

DM501A
DM501A
DM501A Option 2 (no temperature range) on an extension cable
DM501A
DM501A rear connector
DM501A RHS
DM501A LHS
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

@@ Line 8: / Line 8: @@
 {{BeginSpecs}}
-{{Spec | DC Voltage | 200 mV<sub>DC</sub> to 200 V<sub>DC</sub> in decade ranges (0.05% + 0.01% (200 mV: 0.015%) FS), and 1000 V<sub>DC</sub> (0.05% + 0.02% FS); 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 }}
+{{Spec | DC Voltage | 200 mV<sub>DC</sub> to 200 V<sub>DC</sub> in decade ranges, and 1000 V<sub>DC</sub>; 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 }}
-{{Spec | AC Voltage | 200 mV<sub>DC</sub> to 200 V<sub>AC</sub> in decade ranges, and 500 V<sub>AC</sub> (0.6% + 0.05% (500 V:0.2%) FS, True RMS); Input impedance 10 MΩ // ≤160 pF, CMRR 60 dB at 50 or 60 Hz (1 kΩ unbal.)}}
+{{Spec | DC Voltage accuracy | 0.05% + 0.01% (200 mV: 0.015% / 1000 V: 0.02%) FS }}
-{{Spec | DC Current | 200 μA to 2 A in decade ranges, 0.2% + 0.015% FS }}
+{{Spec | AC Voltage | 200 mV<sub>DC</sub> to 200 V<sub>AC</sub> in decade ranges, and 500 V<sub>AC</sub>; Input impedance 10 MΩ // ≤160 pF, CMRR 60 dB at 50 or 60 Hz (1 kΩ unbal.)}}
-{{Spec | AC Current | 200 μA to 2 A in decade ranges, 0.6% + 0.05% FS (for 20 Hz to 10 kHz sine >5% FS) }}
+{{Spec | AC Voltage accuracy | 0.6% + 0.05% (500 V: 0.2%) FS; True RMS; }}
-{{Spec | 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 }}
+{{Spec | DC Current | 200 μA to 2 A in decade ranges}}
-{{Spec | Temperature  | –62°C to +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.) }}
+{{Spec | DC Current accuracy | 0.2% + 0.015% FS }}
+{{Spec | AC Current | 200 μA to 2 A in decade ranges}}
+{{Spec | AC Current accuracy | 0.6% + 0.05% FS (for 20 Hz to 10 kHz sine >5% FS) }}
+{{Spec | Ohms | 200 Ω to 20 MΩ in decade range; current 1 mA, 1 mA, 100 μA – 0.1 μA respectively}}
+{{Spec | Ohms accuracy | 0.15% (20 MΩ: 0.5%) + 0.015% FS }}
+{{Spec | Temperature  | –62°C to +240°C (+0/-6°C or +2/-8°C any probe, uncal.) }}
+{{Spec | 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. }}
 {{EndSpecs}}