3
IR Emitter Adjustment
WARNING!
SHOCK HAZARD
.
When performing the following step, be careful not to come in contact
with AC voltages when working inside the instrument with the cover off and AC voltage applied.
15. Reconnect the AC power cord, and then turn the instrument ON while holding down the front panel
ENT
button to enable the Factory menu
16. Wait until the instrument warms up and the Data Display screen appears before proceeding.
17. 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.
18. If the R37 potentiometer is present on your generation of the H25-IR, adjust it clockwise to a reading of
450 ±20 mW or 540 ±20 mW
(R600 model only), corresponding to the version of the part as seen in
the items required section of this manual containing the part numbers. If your generation of the H25-IR
does not have an R37 potentiometer, the IR Emitter power can be adjusted by pressing the
VOL/RANGE (higher/lower adjustment in small increments) or SETUP/MODE (higher/lower adjustment
in larger increments) buttons on the front of the unit.
Figure 3.
DIGIPOT Adjustment
19. 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.
20. 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 4.20000±volts then return to step 18 to lower
the IR Emitter setting. If the IR Emitter setting is 450±mW adjust the IR Emitter setting
to 375±mW. Next, repeat the DIGIPOT adjustment.
21. Turn OFF instrument and remove AC power cord.
22. Reassemble instrument.
IR EMITTER PARAMETERS
VOLTS=5.7345 mA=77.5
OHMS=75.0
mW=450.0
DIGIPOT=220
IR VOLT=4.2000
NOTE:
Your readings for the other
parameters on this screen may vary.
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