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Function Details
Over Temperature Protection
Over Temperature Protection
The over temperature protection is effective for preventing damage to a channel
from over temperature. If B2900 is used in an environment over 30 C, channel
outputs are limited to the value less than the maximum value. If a channel output
reaches the limit, all channels automatically and immediately set the output to 0 V
and set the output switch to off. And the causal channel is locked automatically.
To unlock the channel, the self-test must be performed. If the self-test does not
report any problem, you can use the channel soon. For performing the self-test, see
"Self-test" on page
3-11.
The maximum output for the condition over 30 C is less than the maximum output
for the specification condition of 23 C 5 C. The channel output limit is given by
the following formula.
( [ ( P
DC
+ 30 - T
MAX
CS
The parameters are described below.
•
DC
: Allowable maximum duty ratio in %, or 0 for DC bias output
MAX
•
P
: Maximum power, 64 W
CS
: Ambient temperature, in C
•
T
AMB
•
V
= 250 V, for |I
OAB
V
= 39 V, for |I
OAB
V
= 21 V, for |I
OAB
V
: Pulse base voltage setting value or DC bias voltage setting value, in V
B
•
I
: Current at pulse base or DC current, in A
B
•
V
= 250 V, for |I
OAP
V
= 39 V, for |I
OAP
P
V
= 21 V, for |I
OAP
P
V
: Pulse peak voltage setting value, in V
P
•
I
: Current at pulse peak, in A
P
6-34
I
) - |V
AMB
OAB
| 105 mA
B
| > 105 mA and |V
| > 6V
B
B
| 6V
| > 105 mA and |V
B
B
| 105 mA
P
| > 105 mA and |V
| > 6V
P
| 6V
| > 105 mA and |V
P
Keysight B2900 User's Guide, Edition 5
I
100
2
| ] / |V
| )
B
OAP
P
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