DM502

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The Tektronix DM502 is a basic 3½ digit digital multimeter plug-in for the TM500 system.

It has an Int/Ext switch that allows alternate input connections via the rear interface to be selected.

The DM502 is available with an input for temperature measurement with a transistor temperatur probe (P6430) using a NPN-Transistor, e.g. 2N2484 (any NPN-Transistor with hFE>150 can be used.

The DM502A model adds an input for a PT-100 temperature probe (P6601), a true RMS converter, and offset circuits to read dB directly in all ranges. An "Option 2" instrument deletes the temperature measurement function, P6601 temperature probe, and all internal circuits associated with this function

The 2-kΩ-measurement range (+HI in DM502A) can be used for diode testing, since a current source of 1mA is active and the reading corresponds to the (forward) voltage drop of the diode in Volt. The voltage can rise to a maximum of 10 V. Use a second voltmeter to measure the voltage if 2 V are exceeded.

Key Specifications

Voltage ranges	200 mV to 200 V in decade steps; 1 kV (DC) / 500 V (AC) top range
Input impedance DM502	10 MΩ or direct JFET input >2 GΩ (by internal jumper)
Input impedance DM502A	10 MΩ
Current ranges	200 μA to 2 A in decade steps
Resistance ranges	200 Ω to 20 MΩ in decade steps

Pictures

DM502

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  DM502 Rear connector

DM502A

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  DM502A right internal

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  DM502A rear interface