DEC VT220 - Page 193

Table 9-2
Output Voltage Specifications (Cont)
voltage
+12 V
-12 v
Specifications
Nominal output
Minimum load
Ma x imum load
Ripple
Noise
Total regulation
Static line reg.
Static load reg.
Long term stability
Thermal drift
Dynamic load reg.
Overload protection
Nominal output
Minimum load
Maximum load
Ripple
Noise
Total regulation
Static line reg.
Static load reg.
Long term stability
Thermal drift
Dynamic load reg.
Overload protect
Value
+12 V
1 A
2.2 A
240 MV p-to-p for < 66 kHz (max)
(see note 1)
1% of peak for > 100 kHz (noise is
super imposed on ripple) (see note 1
+5.0%
+0.5%
+0.2%
0.1%/1000 hr (see note 2)
+0.025% per degree centigrade
(see note 2)
+2.0% (see note 3)
Current limit with foldback (limit
point of 6.5 A max. and foldback at
3.3 A max.)
-12 V
0.0 A
0.2 A
240 MV p-to-p for < 66 kHz (max)
(see note 1)
1% of peak for > 100 kHz (noise is
superimposed on ripple)
(see note 1)
+5.0%
+0.5%
+1. 0%
0.1%/1000 hr (see note 2)
+0.025% per degree centigrade
(see note 2)
+2.0% (see note 3)
Internal current limit by
regulator
9-10