Cooper Instruments & Systems DFI 7000 Digital Force Indicator - Manual (Page 4)

CF11 4 V-May 2003-008-0186-00
button on the front panel, or by interconnecting the RESET and COMMON terminals momentarily on the rear
connector.
Further, the PEAK OUT terminal will constantly monitor the peak detector output signal; the OUTPUT terminals will
monitor the amplifier output normally, but will shift to monitor the output of the peak detector when one of two
conditions occurs:
1. The front- panel PK button is pressed, or
2. The MODE SEL and COMMON terminals continuously on the rear panel are interconnected. The AMP OUT
terminal continuously monitors amplifier output and is not affected by the peak detector.
15
+
S
IG
N
A
L
+
E
X
C
-E
X
C
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O
U
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N
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1
A
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Rear Panel with Peak Option
3.7 Wiring to The Optional Track-And-Hold
The DFI 7000 is available with an option Track-and-Hold unit. This circuit will permit the output signal to closely
track the input signal. The HOLD function is engaged after which the last value obtained is held. The unit may be
placed in “hold” by interconnecting the rear panel HOLD and COMMON terminals, or by switch action on the front
panel. Placing the unit in “hold” will cause the output signal to lock on its last value prior to the ‘hold” condition.
Rear Panel with Track & Hold Option
15
+
S
IG
N
A
L
+
E
X
C
-E
X
C
-O
U
T
P
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T
-S
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N
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1
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3.8 Power Connections
AC power is connected to the unit on terminals 1, 2 and 3. Observe that the AC LO terminal (#2) is connected to
the AC power line neutral (white wire). The AC HI terminal (#1) connects to the “hot” side of the AC power (black
wire). Terminal #3 is chassis ground (green wire). 110 volts, 60 Hz. Is the normal power for the DFI 7000, but 220
volts, 50 Hz. may be provided through jumpering on the Main Board. Contact COOPER for instructions on this
modification.
4.0 INTIAL ADJUSTMENTS/SETUP
Figure 1 – DFI 7000 Control Locations
4.1 Zero Adjustment
The adjustment of the no signal zero indication is made first. For all of the adjustments that follow, the transducer
attached to the unit should not have any applied pressure or load. If the transducer is an absolute pressure unit, it
should be calibrated under a vacuum. Otherwise, the unit will read the present local barometric pressure (approx.