可互换虚拟仪器（Interchangeable Virtual Instruments -IVI），是一个行业标准的HAL。从仪器为中心的抽象的观点来看，顶层的测试应用程序去调用一个以仪器为中心的API函数，这使所有仪器看起来很相似（举个例子，IviScope Configure AcquisitionType）。在以特定应用为中心的方法中，测试应用程序调用一个针对特定应用的API，该API与需要执行的测试的类型一致（例 如，LED测试）。HAL是开发和维护耦合度较低的测试系统时行之有效的方法，它能地解决产品和测试仪器生命周期不匹配的问题，避免测试仪器与测试代码耦合度过高。测试代码与测试仪器的松散耦合，改善了测试系统的整体设计，使其在生命周期之内更易于维护和扩展。
JAMESBURY VPVL051 DA B C 1000CWP 80PSI PNEUMATIC 1 IN N
DYNAQUIP VMB 2000 WOG 1 IN NPT STAINLESS THREADED BALL
GH BETTIS RPB250-SR4 AIR ACTUATOR STEEL THREADED 3/4IN
NELES JAMESBURY 8 IN PNEUMATIC 150 STAINLESS FLANGED BA
NELES JAMESBURY 8 IN PNEUMATIC 600 STAINLESS FLANGED BA
NELES JAMESBURY 8 IN PNEUMATIC 150 STAINLESS FLANGED BA
GMR EMICO 500SF CARBON STEEL SOCKET WELD 3/4IN BALL
SWAGELOK SS-45S8-LL 2 WAY PNEUMATIC STAINLESS 1/2 IN NP
NELES JAMESBURY 5150 31 3600MT EJ-20 ACTUATOR 150 FLANG
WORCESTER CONTROLS MK005 PNEUMATIC THREADED 1-1/2IN NPT
APOLLO CII 1 UBA 600 BRASS 1 IN NPT BALL VALVE B244580
APOLLO 2WAY 600WOG CII BRONZE THREADED 2 IN NPT BALL VA
GRINNELL 8VR 275CWP 150 STAINLESS FLANGED 1 IN BALL VAL
WATTS B-6800 3/4 IN NPT 600 BRASS THREADED BALL VALVE B
APOLLO CONBRACO 2 WAY 1000 WOG SHUT OFF 2 IN STAINLESS
SHARPE SP063N 145PSI PNEUMATIC ACTUATOR 3/4 IN NPT THRE
WORCESTER CONTROLS 1-1/2 BWK446 6T 1-1/2 IN TRI-CLAMP B
VALPRES 40 3/4 IN WAFER STAINLESS BALL VALVE D449022
JAMESBURY QP1C/M QUADRA-POWR II 100PSI DIAPHRAGM 1-1/2
DEZURIK 551 1-1/2 IN PNEUMATIC 150 STAINLESS FLANGED BA
CAMERON 4R-B101 310-B WKM DYNA SEAL 310 4 IN STEEL BALL
NELES JAMESBURY 3 7300 31 3600XTZ 3 IN STAINLESS FLANGE
TRUELINE N620A STAINLESS FLANGED 1 IN BALL VALVE 1000WO
WORCESTER CONTROLS 11/2B4446PMSW 20 ACTUATOR 1-1/2 IN N
BETTIS VELAN EE1000 RPB250-SR3 ACTUATOR STAINLESS 3/4IN
JAMESBURY 530S313600TT QP1C/M QUADRA-POWR II 1-1/2 IN F
WORCESTER 11/2B4446PMSW-R?2 20-39-SN STEEL SOCKET WELD 1
NELES JAMESBURY 5150 31 3600MT 316SS 3 IN 150 FLANGED B
JAMESBURY QP1C/M QUADRA-POWR II 100 PSI DIAPHRAGM CASE
NELES JAMESBURY 24B3600XT1 PNEUMATIC THREADED 2 IN NPT
NORBRO 10-RDA40-1SD1E0?-C 40R 3-WAY 1/2 IN NPT PNEUMATIC
WORCESTER 89466UZ300T4432?R0 720CWP 8 IN STAINLESS FLANG
CONTROMATICS C 1111 AC FP 1150PSI BRONZE 1/4IN NPT
HISAKA TYPE HS 150LB 230PSI ASTM CF8M TFE STAINLESS 2IN
FNW 2000W0G 1/4 IN NPT STAINLESS THREADED BALL VALV
APOLLO 2 WAY 600WOG BRASS THREADED 1-1/2 IN NPT BALL VA
FNW R503 1500PSI-WOG STAINLESS 2 IN BALL VALVE B355328
FNW 02814803 1500PSI-WOG STAINLESS THREADED 1-1/2 IN NP
FNW 02814788 1500PSI-WOG STAINLESS THREADED 1-1/2 IN NP
APOLLO STAINLESS THREADED 1-1/4IN NPT BALL VALVE D3
WORCESTER CONTROLS 11/29466PMSW ACTUATOR 20 SERIES 39 2
BETTIS C228 RPC-250-SR4 ACTUATOR STEEL THREADED 3/4IN N
NELES JAMESBURY 5150-31-3600TT 2 IN ELECTRIC 150 STAINL
WORCESTER CONTROLS E4446RTSW FLOWSERVE 1/2 IN SOCKET WE
MUELLER A-17262 REFRIGERATION BI-DIRECTIONAL 5/8 IN ODS
KTM V-676 3 IN PNEUMATIC 150 STAINLESS FLANGED SEGMENTE
NAS CF8M 1000 WOG 3/4 IN NPT STAINLESS SOCKET WELD BALL
VALBIA SR SET 05 82SR0175 ACTUATOR 1-1/2 IN NPT STAINLE
FNW 1500PSI-WOG STAINLESS THREADED 1-1/2 IN NPT BALL VA
WATTS SE2500-150 STAINLESS SIZE 4IN BALL VALVE FLANGED
SWAGELOK SS-63TF8-330 WITH WHITNEY SR 133 ACTUATOR 1/2I
VELAN S07-M1113-SSG VALVAC STAINLESS THREADED 1-1/2 IN
MAS G-3-SW 1-1/2 IN 1500 SOCKET WELD STAINLESS BALL VAL
AVCO NACE 31214 2000PSI-WOG STAINLESS 1-1/2 IN BALL VAL
APOLLO 2 WAY FLOW CONTROL 316 1 IN 1000 STAINLESS BALL
PSB ARMOR AUTOMATIC ET-4-115 SOLID STATE TIMER-DRAIN VA
WORCESTER CONTROLS 11/2B4446PMSW 120PSI 20 ACTUATOR 1-1
FNW FNW340EK TRUE UNION PTFE SEAT EPDM O-RING PVC 2
SWAGELOK SS-43GS4-31C 2-WAY ACTUATOR STAINLESS 1/4I
CONBRACO CII APOLLO 1-1/2 IN NPT BRONZE THREADED BALL V
VELAN S08-M1113-SSG VALVAC 1500PSI-WOG STAINLESS 2 IN N
WORCESTER CONTROLS 3/4B4446PMSE ACTUATOR 10 120PSI 3/4
NIBCO F-515-S6-F-66-F?S NSR 8 F05 STAINLESS FLANGED
GRINNELL 1/4 IN NPT 600 BRONZE THREADED BALL VALVE D457
WATTS 600 WOG 2WAY THREADED 2 IN NPT BALL VALVE B341411
WHITEY SS-63TS12 2200PSI 3/4 IN NPT STAINLESS THREADED
FISHER V200 1052 VEE BALL PNEUMATIC 150 STEEL 2 IN BALL
SMC PVC-638-4F4M-B TWO-WAY PVC THREADED 1/4 IN NPT
WORCESTER 1-4446PMSW-R2 20-39-SN 39 ACTUATOR STEEL 1 IN
FLOWSERVE 15 AT13-6666TT STAINLESS 1-1/2 IN FLANGED
DYNAQUIP VMH2-A9JP-1/2 BRASS THREADED 1/2IN NPT BAL
WORCESTER CONTROLS 4466RT STAINLESS THREADED 3/4IN
JOHN VALVES 2000 WOG CF8M SR 75 ACTUATOR 10 BAR 1-1/2 I
APOLLO 86-500-01 1500WOG STAINLESS THREADED 1-1/4 I
FNW 5T77W 1500PSI-WOG STEEL THREADED 1-1/2 IN NPT BALL
HAYWARD TB2125ST TRUE UNION CPVC 1-1/4IN BALL VALVE
NELES JAMESBURY 2 5150313600-TT ACTUATOR ST50E STAINLES
MILWAUKEE 20SSOR-02-LL 2000WOG 3/8 IN NPT STAINLESS
FNW R502 1500PSI-WOG STAINLESS 2 IN BALL VALVE B355476
NELES JAMESBURY 2-5150-31-3600T?T ST50E PNEUMATIC ACTUAT
FISHER V500 1051 VEE BALL PNEUMATIC 300 STEEL FLANGED 4
FISHER V200 1052 VEE BALL PNEUMATIC 150 STEEL 2 IN BALL
WORCESTER 3 45 4 6PT SW R2 STEEL 3IN BALL VALVE SERIES
KTM DEZURIK 1094942 CF8M CLASS 150 STAINLESS 8IN SEGMEN
FLOW 50B-92 CONTROL STAINLESS FLANGED 1 IN BALL VALVE B
TA CHEN TC-03S 1000WOG FLOW 1-1/2 IN STAINLESS FLANGED
FG INOX A73449 WAFER SPHERE STAINLESS 4 IN BALL VAL
HAYWARD TB10200ST PVC THREADED 2 IN NPT BALL VALVE
DEZURIK A2329 KTM CF8M SEGMENTED 150 STAINLESS 8IN FLAN
MILWAUKEE WOG 2000 STAINLESS THREADED 1/2 IN NPT BALL V
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