HP 435B - Page 44

M o d e l
435
Β
2 .
MATH
A
SS
UMPTI
O N S :
AD JUST MEN TS
5-6 . P
O
WER REFEREN
C E OSCI LL ATO R LEVEL AD JUST MEN T (Cont'd)
TYPI C AL

1 . A CC
U
RA
C
Y
C AL C U L ATI O N S :
DVM M
eas ur e m e n ts :
(HP 3455 Α
-90
d a y s,
23°C ±5°C)
M at h A ss ump tio n s :

±0 .01% ο
EFFE C TIVE EFFI C IEN C Y C AL (NBS) :

±0 .5% ο
MI S MAT C H UN C ERTAINTY :
(So urce & M oun t S W R <_1 .05)

±0 .1% ο
<± ρ
.7% ο
Ρ RF
=
2 V c
οΜΡ
( V 1-
μο )
+
V
ο
2- μ 1
2
(4 R ) (EFFE C TIVE EFFI C IEN C Y)
A ss um e :
V
ο
2- μ 1 2=-(
μ 1
- μ ο )2
S
in
ce : -(V 1 -V
ο
)
2
=
V 1 2 +2 V 1 V ο - V ο 2, a nd
we wa
n
t : V ο 2 - V 1 2 , t h e n
t h eer ro ri s : (-
V 1 2 +2 V
,
V
ο
-
V ο 2 )-( V ο 2 - V
1
2
)=-2 V ο 2 +2 V , V ο =2 V ο (V 1
-V ο )
if 2
V ο (V 1- V ο )
< <
2 μ C ΟΜΡ
(V1
- V ο ) i
.e ., V ο
< <
V
c
οΜΡ ,
e rr or i s n eg li g ibl e
Vc οΜΡ
-
4
v o l ts . If
V ο < 400 μ
V , er
r
or is <0 .01% ο .
(t ypi
ca lly
Vo can
b
e set to <50 μ V .)
3 .

D eriv at i o n o f F o rmul a f o r
V 1- V ο
Ρ RF
=
2
V ςΟ
ΜΡ ( V 1-
V ο )+ V ο 2- μ l2
(4 R ) (EFFE C TIVEEFFI
C IEN C Y)
D es ir e dΡ RF = 1
MW
=10-3
: .1 ρ
-3
=
2 μςΟΜΡ ( μ 1-
μ
o)
+ μο 2-- μ l2
(4 R ) (EFFE C TIVE EFFI C IEN C Y)
(V
co m p)

±0 .018% ο
( V 1
- V
o)

±0 .023% ο
(R) ±0 .03% ο
Ad j u st m
e
n
ts
L et (4 R ) (EFFE C TIVE EFFI C IEN
C
Y) (10
-3 ) =
Κ
Sub st i t u te -
(V1
- V
ο ) 2
f o r
Vo
2 - V
1
2
(see m at h
A
ss ump t i o n s und e r A cc ur ac y )
Th e n 0 = ( V 1-
V ο ) 2
-2 V
ςοΜΡ
(Vi
- V ο )+
Κ
o r V 1 - V ο = V c
οΜΡ - ( μ c οΜΡ ) 2-
Κ