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Operating Information and Specifications—221 Service
Horizontal Deflection System
Sweep Generator:
Calibrated Range; 200 milliseconds to one microsecond/
division in 17 steps.
Accuracy (over center eight divisions): Within 3% with
VAR SEC/DIV in the CAL position.
Linearity (any tw o division portion, w ithin the center
eight divisions): Within 3%, disregard first 1 microsecond
of sweep.
SEC/DIV
VAR
(Variable):
between calibrated setting of the SEC/DIV switch. Extends
minimum sweep rate to approximately 0.5 s/div. Each
sweep rate is decreased 2.5:1.
Horizontal Magnifier (HORIZ-MAG 10X)
magnifier when SEC/DIV is in CAL detent. Accuracy
w ithin
5%, disregard the first 1 microsecond of the
sweep.
External Horizontal Input:
Deflection Factor: One volt/div IX , 0.1 volt/div 10X.
Accuracy w ithin 10%.
B andw idth:
With
six
500 kilohertz.
Input Resistance: Approximately 500 kilohms.
Input Capacitance Approximately 30 picofarads.
Maximum Safe Input Voltage: 200 volts (dc to peak ac),
200 volts peak-to-peak ac.
M axim um
Usable
Input
± nine volts.
Display
Graticule:
Type: Internal back line, non-illuminated.
Area: Six vertical divisions by 10 horizontal divisions.
Phosphor: P31 Standard.
1-2
Continuously
variable
Calibrated
division
reference
dc
to
Voltage:
Approximately
Power
Line Voltage Operation:
Line Voltage Range: 90 V to 250 V ac; 80 V to 250 V dc.
Line Frequency Range: 48 to 62 Hertz.
Maximum Power: Five watts.
Line Fuse: 0.2 A 250 V.
Common Isolation:
Line Operation: Line voltage plus floating voltage not
greater than 250 volts RMS sine wave, or 1.4 times line
voltage + dc + peak ac floating voltage not greater than
350 volts.
Battery Operation:
floating voltage not greater than 500 volts RMS or
700 volts dc + peak ac.
Battery Operation:
Batteries: Ten rechargeable A nickel-cadmium cells.
Charge tim e: 16 hours for fu ll charge.
Battery Charge Indicator- Battery meter indicates Full,
Low and Recharge. Recharge is indicated after automatic
shut-off turns instrument off.
Battery Discharge Charge Protection: Instrument opera
tion automatically interrupted when battery charge is less
than 10 volts.
Typical Operating Time (after full charge cycle at +20°C
to +30°C): Two to three hours. Longest operating time
provided at low trace intensity.
Typical Charge Capacity
(Referenced to charge/discharge at +20°C to +30°C):
TAB LE 1-1
OPERATING TEM PER ATU RE
CHARGE
TEM PER ATU RE
+15°C
0°C (+32° F)
40%
+20° C to +30° C
65%
(+68° F to +86° F)
40° C (+104°F)
40%
Common to outside of case
+20° C to +30° C
+55° C
60%
50%
100%
85%
65%
55%
REV. B, FEB. 1976
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