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TELEDYNE INSTRUMENTS M100EU – OPERATIONS MANUAL
TROUBLESHOOTING & REPAIR
Addendum to M100E Manual - P/N 04515
11.3.4 M100EU PMT HARDWARE CALIBRATION (FACTORY CAL)
THIS PROCEDURE SUPERSEDES THE ONE CONTAINED IN SECTION 11.6.3 OF THE M100E MANUAL -
P/N 04145.
The sensor module hardware calibration adjusts the slope of the PMT output when the Instru
ments slope and
offset values are outside of the acceptable range and all other more obvious causes for this problem have been
eliminated. Because the PMT HV is remotely controlled and there is no PMT preamp gain adjust, this procedure
is done automatically through the analyzer software.
1. Set the instrument reporting range to SNGL & 500 p
p
b (see Section 6.7.4 of the M100E Manual - P/N
04145)
2. Perform a full zero–point calibration using zero air (see Ch
apter 7 of the M100E Manual - P/N 04145).
3. Let the instrument stabilize by allowing it to run for one hour.
4. Adjust the UV Lamp. (See Section 10.5.
1.1 of this ad
dendum)
5. Perform a L
A
MP CALIBRATION procedure (see Section 6.9.7 of the M100E Manual - P/N 04145).
6. Feed 400 ppb span gas into the analyzer.
7. Wait approximately 30-60 minutes (or until the stability reads ≤ 0.1 ppb), then u
n
der the DIAG menu
select PMT CALIBRATION.
8. Either press ENTR if you are us
ing 400 ppb or change the concentration value to what is appropriate
and then press ENTR.
9. Select the range that you wish to setup (low or high).
10. Wait two to three minutes until you get a message that indicate
s the
HV has been adjusted successfully.
NOTE
If a reporting range other than 500 ppb is used in this procedure:
Use a span gas equal to 80% of the reporting range and adjust the PMT to a target NORM PMT value of
twice the ppb value of the span gas.
EXAMPLE
If the reporting range is 800 ppb then set the target concentration to 640 ppb for this procedure.
11. Wait until the STABIL value is ≤ 0.1 ppb.
12. Scroll to the NORM PMT value and verify that it is approximately twice the ppb value of the span ga
s.
13. Perform a zero / span calibration.
14. Check the slope and offset values and compare them to the values in Table 7-5 of the M100E
Manual -
P/N 04145.
15.
Steps 7 - 14 may have to be performed more than once in order to compensate for any
over/undersh
ooting of the PMT reading based on the adjusted HVPS drive voltage. Best results occur
after performing the PMT calibration (steps 7 - 14) at least two consecutive times
36 05944 Rev B
PRINTED DOCUMENTS ARE UNCONTROLLED DCN 5063