Chroma 61503 - Ext. V, Couple

Programmable AC Source 61501/61502/61503/61504 User’s Manual
3-12
The remote inhibit is a TTL signal transferred via the special I/O
connector. For detailed please refers to pin assignment in Appendix A
Pin Assignment of TTL S.
3.6.2 EXT. V, COUPLE
The AC source allows the user to make use of the controlled analog signal from external
devices for the setting of its output. The BNC connector of the EXT Vref on the rear panel
lets the user apply signal to the AC source for the setting of output voltage. The user can
set EXT. V and COUPLE on CONF functional list (see 3.6). There are two coupling mode to
present AC source output from external V reference: AC_AMPLIFIER and DC_LEVEL_CTL.
AC_AMPLIFIER: The output voltage (Vout) is the synthesis of voltage programming on
MAIN PAGE and the amplification of external V reference with
voltage range from -10 V to 10 V. When Vac=0 and Vdc=0 on
MAIN PAGE, Vout can be calculated using the following formula:
Vout (dc) = Vref (dc) / 10 Vdc × 424.2 Vdc (300V RANGE)
Vout (dc) = Vref (dc) / 10 Vdc × 212.1 Vdc (150V RANGE)
or
Vout (ac) = Vref (ac) / 7.072 Vac × 300 Vac (300V RANGE)
Vout (ac) = Vref (ac) / 7.072 Vac × 150 Vac (150V RANGE)
Example (1): set Vout to 100Vdc:
1. Select RANGE = 300V in SETUP functional list, apply external V= 2.357Vdc,
the Vout = 100Vdc.
2. Select RANGE = 150V in SETUP functional list, apply external V= 4.715Vdc,
the Vout = 100Vdc.
Example (2): set Vout to 100Vac :
1. Select RANGE = 300V in SETUP functional list, apply external V=
2.357Vac, the Vout = 100Vac.
2. Select RANGE = 150V in SETUP functional list, apply external V=
4.715Vac, the Vout = 100Vac.
DC_LEVEL_CTL : The output voltage (Vout (ac)) responses linearly proportional to the
controlled DC level with voltage ranging from -10 V to 10 V. Vout
can be calculated using the following formula:
Vout (ac) = |Vref (dc)| / 10 Vdc × 300Vac (300V RANGE)
Vout (ac) = |Vref (dc)| / 10 Vdc × 150Vac (150V RANGE)
Example (1): set Vout to 100Vac :
1. Select RANGE = 300V in SETUP functional list, apply external V= 3.333Vdc
( or -3.333Vdc ), the Vout = 100Vac.
2. Select RANGE = 150V in SETUP functional list, apply external V=
6.667Vdc (or -6.667Vdc), the Vout = 100Vac.
The procedures of setting EXT. V = ON, COUPLE = DC_LEVEL_CTL, are described as
below: