Chapter : Maintenance
[12] Connect oscilloscope on the Output connector. Load with a 50Ω . Choose
a repetition period of about 5 µs.
[13] Turn the boxduration adjustment knob to its last position. Adjust the Max
duration capacitor (2) to have an output pulse of 200 ns +/-5 ns.
[14] Turn the boxduration adjustment knob to its first position. Adjust the pot Out
0ns adj (1) in order that the output pulse is 0ns. The pulse is 0 ns long when its
shape is triangular with an amplitude of 1,1 V (half of the maximum value).
[15] Repeat points [13] and [14] until the values are OK.
[16] Check the operation of the boxGate in external mode. A signal is present
on the Output output connector if the input Gate in open (high TTL level) =
gate open; no signal is measured on the Output output connector indicates a
short circuit on on input Gate in (low TTL level) = gate closed.
[17] Check that the +12 V is present on the Lemo 00 connector (+12 V on the
centre connector).
Figure 7.18.: TPG main board
104 QCL user’s manual v3.1.3
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