Cooper Instruments & Systems DFI 1650 Multi-Channel Digital Force Indicator - Manual (Page 58)

CF 66 52 Rev. C 2/05
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 range 5, ±5, 10 or ±10 VDC (field selectable)
Output current range (optional current output
channels)
4-20 mA
Source Any channel’s track, peak or valley value
Isolation 500 V
Resolution 13 bits
Frequency Response Same as input if driven by the same channel’s tracking data
(1) Total excitation current of all channels must not exceed 120mA for DFI 1550, DFI 1650 or DFI 1650PT and 310
mA for DFI SC3004.
12.6 Channel Menu
Each High-Level 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.
12.6.1 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 remove 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.
FREQ.RESPONSE Menu Item
This sets the frequency response, step response, and resolution of the channel according to the table below. The
tracking value, peak/valley detector values and analog output on this channel are all affected. The default value of
016.HERTZ is suitable for most applications.
Frequency
Response
Step Response (ms)
(typical)
Resolution (counts)
(not including min. 10%
overrange/underrange capability)
5V & 10V Inputs 1V & 4-20mA Inputs
002. HERTZ/FAST 40 ±50000 ±50000
002. HERTZ 440 ±50000 ±50000
008. HERTZ 110 ±25000 ±25000
016. HERTZ 55 ±25000 ±20000
032. HERTZ 28 ±20000 ±10000
050. HERTZ 16 ±15000 ±10000
100. HERTZ 8 ±10000 ±50000
250. HERTZ 3 ±10000 ±50000