Document type:
Title:
Revision date:
Revision:
User's Manual (MUT)
Mod. V993 B Dual Timer
03/03/2004
3
NPO:
Filename:
Number of pages:
Page:
00114/00:V993x.MUTx/03 V993B_REV3.DOC
10
10
3.3. Output width adjustment
Each section has a 9-position rotary switch for performing the COARSE ADJUSTMENT
(see § 2.5). Actually this switch allows to choose between nine width ranges:
50 ns ÷ 1 µs
1 µs ÷ 10 µs
10 µs ÷ 0.1 ms
0.1 ms ÷ 1 ms
1 ms ÷ 10 ms
10 ms ÷ 0.1 s
0.1 s ÷ 1 s
1s ÷ 10 s
∞
: Flip-Flop
Actually the 9
th
position (
∞
) lets the module work as a Flip-Flop: the output is kept active
unless a Reset occurs. Once the COARSE ADJUSTMENT is set, the FINE
ADJUSTMENT must be performed either by turning the relevant rotary handle or by
supplying the WSET connector with a DC voltage ranging from 0 to 5 Volts: the
WSET/FINE ADJUSTMENT SWITCH allows to select between the two ways:
Left
→
WSET, Right
→
Rotary Handle (see § 2.5).
3.4. Output level selection
Two dip switches (one per section, named SW4 and SW8 respectively) allow to produce
either NIM or TTL pulses on the LEMO 00 output connectors. The switches’ setting is:
Dot NOT visible
→
NIM
Dot visible
→
TTL
Such swithces are placed on the printed board, close to the front panel. ECL output
pulses are produced in any case on the relevant male pins.
3.5. LEDs
operation
The front panel LEDs are OFF when no output is present; they light up following the
output with widths larger than 0.5 s; they light up for a fixed time (
≈
0.5 s) with output
pulses shorter than 0.5 s. They flash at a constant frequency (
≈
2 Hz) with output
frequencies higher than 2 Hz. They light up red for NIM output pulses and green for TTL
ones.