Fisher DPR900 User Manual page 57

Configuration
5-3
5.4.1
54.1 .l
m
1...5...9
DPRY"O-58a
5.4.1.2
l--Dial
5.4.1.3
5.4.1.4 Measuring Range
1...5...!3
DPRwh58a
Function Parameters FCODE Range Unit Increment Default Selected
Vallle
Vallle
Analog Time constant All 15 o-9999 * 1s 0
Input
Time constant Al2 16 OK3999 s Is 0
Filter
Time constant Al3 17 O-9999 s IS
0
Time constant Al4 18 o-9999 s
IS 0
The first parameters to be determined are those for the analog input
measuring range, and the number of decimal places to be shown on
the digital display. Use engineering units, such as ft3/hr (m3/hr),
gals/min (liters/min, OF ("C), etc.
It is not possible to assign two different functions to one input. If the
user attempts to assign a second function to an input that has already
been assigned, ERROR flashes on the digital display. When this
happens, the user should assign the function to an unassigned input.
Alternatively, the user may reconfigure the input signal line by
removing the original function.
Analog Inputs (Al)
Current or Voltage Inputs
To use an input as a current input, the appropriate jumper must be
intact.
Jumper 1 = All, Jumper 2 = Al2, Jumper 3 = Al3 and Jumper 4 =
A14.
These jumpers connect 250 ohm resistors in parallel with each input.
To use an input for voltage, the appropriate jumper must be cut.
Fixed or Floating References (Return Lines)
To provide an input with a fixed reference the appropriate jumper must
intact.
Jumper 5 = All, Jumper 6 = Al2, Jumper 7 = Al3 and Jumper 8 = Al4
The jumpers set the common-mode voltage for each input to the
range -5V to +17V. The 5V signal voltage is added to this, giving a
total or 17 +5 = 22V, which can vary by +I- 10%. In order to obtain a
floating reference the appropriate jumper must be cut.
Low-Pass Filter
A first-order, low-pass filter for any of the analog inputs, may be
enabled if required. To enable a filter, use FCODE 15 thru 18 to select
the filter time constant. Set a time constant using the green
increase/decrease buttons on the front panel.
May 1991