Bacharach H25-IR - Manual (Page 56)

Parts &Service H25-IR
50 Instruction 3015-4342
3. Press the ENT and ESC buttons simultaneously to access the Main menu. From the Main menu,
select DIAGNOSTICS > IR EMITTER to display the IR Emitter Parameters screen.
4. Adjust potentiometer R37 located on the main board for an IR Emitter reading of 800 ±20 or 450
±20 mW, corresponding to the user’s version of part as seen in the items required section
containing the part numbers.
5.4.5.4 DIGIPOT Adjustment
1. Press ESC twice to return to the Main menu. From the Main menu, select FACTORY > DIGIPOT to
display the DIGIPOT screen.
IMPORTANT! When performing the following Step, the instrument must be sampling fresh air
(zero gas) when adjusting the DIGIPOT value.
2. Use the Up and Down buttons to adjust the DIGIPOT value until the IR VOLT reading is
4.2000 ±0.0500 volts. Press ENT to save the new DIGIPOT value.
IMPORTANT! If adjusting the DIGIPOT does not reach 4.2000 ±0.0500 volts then return to stepn 18 to
lower the IR Emitter setting. IF the IR Emitter setting is 450 ±20 mW adjust the IR
Emitter setting to 375 ±20 mW. Next, repeat the DIGIPOT adjustment.
3. Turn OFF instrument and remove AC power cord.
4. Reassemble instrument.
5.4.5.5 Factory Calibration
NOTE: Factory calibration establishes the instrument’s default calibration setting that is recalled when
“RESTORE FACTORY CAL” is selected from the CAL DATA menu.
1. With all covers in place, turn the instrument back ON while holding down the front panel ENT button to
enable the Factory menu.
IMPORTANT: Before calibrating, allow the instrument to warm up for at least 15 minutes.
2. Perform an internal calibration as described in the H25-IR instruction manual, 3015-4342.
IR EMITTER PARAMETERS
VOLTS=5.7345 mA=77.5
OHMS=75.0
mW=450.0
DIGIPOT=220
IR VOLT=4.2000
NOTE:
Readings for the other
parameters on this screen may vary.