D-6. Converting Current to Voltage
Recording devices with voltage inputs can be converted to current inputs by
shunting their input terminals with an appropriate resistor. The resistor value is
calculated as follows: Resistor ( ) = 50 x Input voltage range of recording device. For
example, a chart recorder with an input range of 1 V uses a 50- (1 %, 1 W) resistor
across the recorder input.
Note: Do not exceed 300 Ω (see Section D-5 on the previous page).
D-7. AC Power Supply Terminal Block and External Ground
Lug
The ac power supply terminal block is located on the left side of the electronic
card cage (Figure D - 13 below). The connections are described in Table D - 4 on the
next page.
The ac cable must have multi-stranded copper wires, an inner shield, a steel
armor and an overall PVC jacket. The conductor size depends on the cable length;
refer to the applicable standards and local regulations. Ground the cable armor.
Figure D - 13: Wiring of the AC Power Supply Terminal Block
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