Load Mode
The ten position Load Mode switch is encoded to a 4-bit binary code by priority encoder IC4. All
signals associated with this encoder are active low. The switch pulls one input line low and the
encoder produces the binary output corresponding to this input. Should a fault occur causing
more than one input to be low, the encoder will ignore all except the highest numbered one. See
the function multiplier section for a table describing how these signals are decoded on the main
PCB.
Independent signals from Control PCB:
IEN H = Input Enable requested.
SST H = Slow Start required.
FR1, FR0: Frequency range: HH = high range, HL = mid range, LH = low range, LL is not used.
SR1, SR0: Slew Rate range: HH = high range, HL = mid range, LH = low range, LL is not used.
Level Control Selection Signals:
SA: L = Select Level A.
SB: L = Select Level B.
SR: L = Select Remote Analogue Input.
ST: L = Use internal transient oscillator.
SE: L = Use the external remote control input as a logic signal to control transients.
Meters Selection Signals:
DAB: L = Display Level A and Level B settings.
DFD: L = Display Frequency and Duty Cycle settings.
DSX: L = Display Slew Rate and Dropout Voltage settings.
DWR: L = Display actual Watts and Ohms values.
(None:) All H = Display actual Volts and Amps values.
Analogue Signals on the Control PCB:
FS Full Scale (from main PCB to controls).
LVLO Level low (a slightly negative voltage from the main PCB to the bottom of the level A
and B pots).
LVA Level A setting.
LVB Level B setting.
XOLO Dropout Low (a slightly negative voltage from the main PCB to the bottom of the
dropout pot).
OFFV Dropout Voltage setting.
FRQV Frequency control voltage.
SLWV Slew Rate control voltage.
DTYV Duty Cycle control voltage.
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