DM502
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.
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 |
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| 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
