Powering an SPD-100, SPD-700, or other frequency
instruments
The SST-2000A/H has a repeater output that can be used to power external
frequency instruments.
A square wave (14-volt peak-to-peak, zero-based, positive-going) is brought out
at terminals 29 and 4 (common) to drive self-powered digital tachometers such as
the SPD-100, SPD-700, and MTH-103D, or to use as a conditioned high level
signal source into counters or other instruments. The frequency of the signal is
equal to that being applied at the signal input: terminals 5 (+) & 6 (–).
This output has an internal resistance of 1 kΩ.
Using DPM-105 meters as external speed indicators
You can use the DPM-105 as an external indicator. You can connect one or
more DPM-105 meters to your SST-2000A/H.
The 0-1 mA meter output of the SST-2000A/H [terminals 7 (–) and 8 (+)] is
factory-calibrated into an external load of 40 Ω. The load resistance of the
DPM-105 is 95 Ω.
Connecting one DPM-105
1 On the DPM-105, retain the jumper across terminals 1 and 2.
2 Connect the meter as shown in Fig. 3-3.
3 Calibrate the SST-2000A/H.
14
Chapter 3
Fig. 3-3 Connecting
one DPM-105 to the
SST-2000A/H.
t Keep the jumper
between terminal 1
& 2 on the DPM-105
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