Elgar CW 1251P, Programming Manual

Power-On and Reset Conditions 

Elgar CW-P Series 

In addition, unique system settings are read in from the non-volatile EEROM memory: 

• 

Output Relay State, either Auto Start or Standby 

• 

Keyboard Lock State, either Front Panel Program Enabled or Disabled 

• 

Master/Slave status if part of a multi-unit configuration  

2.3 

2.4 

2.5 

Reset 

Conditions 

When the *RST command is sent via SCPI, the following conditions apply: 

• 

Faults are cleared 

• 

The error queue is cleared  

• 

The output relay is opened 

• 

VoltsA, VoltsB, VoltsC are set to 0 

• 

A locked keyboard remains locked. 

Changing Voltage Ranges Via Command Interface 

When the voltage range is changed using the command interface: 

SOUR:VOLT:RANGE 1 

If moving from low range to high range, and the output relay was initially in the closed 
state, the CW will open the output relay. In this case, the programmer must re-close the 
relay and set the new voltage.  

Changing Ranges During Recall Via Command Interface 

Assume that the CW is in low range with the output relay closed and sourcing 100 volts. 
If a recall is performed:  

SYST:RECALL 33 

And the recalled system state was initially saved in high range, the output relay will 
open, the new system values will be read into the CW parameters, the CW will shift into 
high range, and the output relay will re-close. The entire process takes approximately 
two seconds. The CW cannot change ranges seamlessly with the output relay closed 
during the transition.  

2-2 Programming 

Manual