Cooper Instruments & Systems DFI 1650 Multi-Channel Digital Force Indicator - Manual (Page 32)

CF 66 26 Rev. C 2/05
10.4 Specifications
10.5 Channel Menu
Each Strain-Gage Input channel is configured and calibrated via its channel menu. Detailed instructions on
operating the instrument in the SETUP Menu mode can be found in “SETUP Menu mode”. A diagram of all menus
is located in “Setup Menu Reference” in Chapter 18.
10.5.1 OPERATION Sub-Menu
This menu controls the operation of this channel when the instrument is in the RUN mode.
AUTO-ZERO Menu Item
This enables or disables the channel’s automatic zeroing function. The auto-zero function can be beneficial by
removing the effect of slight temperature shifts in the transducer’s output. The two options for this menu item are
“ON” and “OFF”.
When enabled, the channel will reset its tracking value to zero when the tracking value has never been more
positive than +10 or more negative than –10 display counts for any 10 second period.
For example, assume that the DISPLAY. DECPT menu item is set to 000.00 (two decimal points). If the tracking
value never leaves the range of –000.10 to +000.10 for any 10-second period, then tracking value will reset to
000.00 automatically.
To compensate for the transducer’s initial warm-up shift, the auto-zero function operates every 2 seconds during
the first 60 seconds of RUN mode operation.
TRANSDUCER INPUT
Transducer type Full-bridge, strain gage
Excitation Voltage 5 or 10 VDC, short circuit protected with sensing
Transducer full-scale output .5 to 21 mV/V @ 5V excitation
.5 to 10.5 mV/V @ 10 V excitation
Amplifier Gain Selection Automatic
Calibration Type Shunt, mV/V or 2-,3- or 5-point known load
Differential Input Voltage +/- 105mV (max.)
A/D Converter 24-bit Sigma-Delta
Low-pass filter Digital, 24-tap FIR
Resolution and Frequency Response See “FREQ.RESPONSE Menu Item”
INSTRUMENT-ONLY ACCURACY
(Sense wires used; Frequency Response setting <=16Hz;
Linearity, repeatability & hysteresis)
mV/V Calibration ±0.1% F.S.
Known-Load Calibration ±0.01% F.S.
AUXILLIARY INPUTS
Quantity 2
Type Momentary contact closure
Response Time <5ms
Field-Selectable Functions Tare on, tare off, peak/valley clear, peak/valley hold, track hold.
ANALOG OUTPUT
Output voltage 5, ±5, 10 or ±10 VDC (field selectable)
Output current range (optional current output
channels)
4-20mA
Source Any channel’s track, peak or valley value
Isolation 500V
Resolution 13 bits
Frequency Response Same as input when driven by the same channel’s tracking data