Teledyne 200AH 用户手册

 

C.  The M200AH will display a voltage near 1% of the voltage range set in the above 

procedure. Adjust R27 until the displayed voltage matches the DVM voltage, then press 
ENTR. 

D.  The M200AH will display a voltage near 90% of the voltage range set in the above 

procedure. Adjust R31 until the displayed voltage matches the DVM voltage, then press 
ENTR. This step calibrates the instrument A/D converter to the external DVM. 

The next task is to calibrate each of the 4 DAC output channels. The NEXT - PREV buttons 
allows selection of any of the 4 D/A channels. DAC0 - the NO

X

 channel - is displayed first. 

E.  The SET button has 2 functions, first to select the output mode - voltage or current. Press 

VOLT and CURR depending on the type of output desired. - Remember, the VOLT or 
CURR setting must match the switch and jumper settings made previously. Second, 
the voltage output can be biased up to 

 10% of the selected range with the OFFSET 

parameter. Just key in the desired offset, or press EXIT to leave the OFFSET at zero.  

F.  For DAC channels in VOLTAGE mode, press CAL. This will cause the instrument to 

automatically calibrate the channel. 

G.  For DAC channels in current mode, first connect a 250 ohm resistor in series with a 

current meter to the correct pair of terminals on the rear panel, see Table 9-6 for terminal 
assignments. Press CAL. The instrument will output 4 mA to the rear panel terminals. UP, 
DOWN and ENTR buttons will be displayed. Press the UP - DOWN buttons until the 
correct reading is displayed on the meter, then press ENTR. 20 mA is then output to the 
rear panel. As before, press the UP, DOWN buttons to get the correct reading, then press 
ENTR. 

H.  To go the next channel press the NEXT button and follow the previous steps starting with 

step - f. Proceed through all 4 DAC channels, then exit. To back up to previously 
calibrated channels, press the PREV button. 

Several different output voltage ranges can be selected by switch settings on the V/F board. See 
Figure 9-4. If you change the analog output voltage range, the power to the instrument should be 
turned off, then on and a DAC calibration performed (Section 9.3.3.1).